package com.itheima.reggie.controller.front;

import com.itheima.reggie.common.Result;
import com.itheima.reggie.constant.CommonConstant;
import com.itheima.reggie.util.AliyunOssUtil;
import lombok.extern.slf4j.Slf4j;
import org.apache.http.HttpEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClientBuilder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.util.UUID;

/**
 * 文件上传和下载
 */
@RestController
@RequestMapping("/fronts/common")
@Slf4j
public class FCommonController {
    @Value("${"+ CommonConstant.IMAGE_PATH+"}")
    private String basePath;

    @Value("${"+ CommonConstant.OSS_IMAGEURL+"}")
    private String ossimageUrl;

    @Autowired
   private AliyunOssUtil aliyunOssUtil;

    /**
     * 文件上传
     * @param file
     * @return
     */
    @PostMapping("/upload")
    public Result<String> upload(@RequestParam("file") MultipartFile file){
        //file是一个临时文件，需要转存到指定位置，否则本次请求完成后临时文件会删除
        log.info(file.toString());

        //原始文件名
        String originalFilename = file.getOriginalFilename();//abc.jpg
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));

        //使用UUID重新生成文件名，防止文件名称重复造成文件覆盖
        String fileName = UUID.randomUUID().toString() + suffix;//dfsdfdfd.jpg

        try {
            aliyunOssUtil.uploadIS(file.getInputStream(),fileName);

        } catch (Exception e) {
            e.printStackTrace();
        }
        return Result.success(fileName);
    }

    /**
     * 文件下载
     * @param name
     * @param response
     */
    @GetMapping("/download")
    public void download(String name, HttpServletResponse response){
        try {

            CloseableHttpClient httpClient = HttpClientBuilder.create().build();

            HttpGet httpGet = new HttpGet(ossimageUrl+name);
            CloseableHttpResponse responses = null;

            responses = httpClient.execute(httpGet);
            HttpEntity responseEntity = responses.getEntity();
            InputStream fileInputStream = responseEntity.getContent();

            //输出流，通过输出流将文件写回浏览器
            ServletOutputStream outputStream = response.getOutputStream();

            response.setContentType("image/jpeg");

            int len = 0;
            byte[] bytes = new byte[1024];
            while ((len = fileInputStream.read(bytes)) != -1){
                outputStream.write(bytes,0,len);
                outputStream.flush();
            }

            //关闭资源
            outputStream.close();
            fileInputStream.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }


}